Explain call by reference, C/C++ Programming

Assignment Help:

Call by Reference

Passing variables(parameters) to a function in C can be done in two ways - pass by value, also called as call by value and pass by address or also known as call by address. C++ though , gives one more way to call a function - call by reference. In call by value , a copy of the actual contents of the variables is passed to the function. In this case, alters made to the formal variable , as they are called, are not reflected back in the calling function. Passing an address permits changes to be made directly to the memory, which are occupied by the actual variable.

Though, a call by address requires the formal variable to be considered as pointer and therefore the indirection operator has to be used with them. A reference on the other hand, is another name, for a previously explained variable. In other words, after a reference is explained for a particular variable, using its original name as well as the reference can refer to the variable. Hence, a reference is nothing but an alias.

 Thus not passing a copy (call by value) saves time and is efficient. It does not have to make a temporary variable /. And not passing the address(call by address), eliminates the use of pointers in the called functions. But, at the same time, the changes made to a formal variable , using its reference or alias can be reflected back in the calling function.

 


Related Discussions:- Explain call by reference

Is always the default constructor for fred fred::fred()?, Is always the def...

Is always the default constructor for Fred Fred::Fred()?

User-defined data type, Explain  U s e r - D e f i n e d D a t a...

Explain  U s e r - D e f i n e d D a t a T y p es? C has Union and Structure as user-defined data types.  C++ has class which looks like structure with a

Arithmetic operation, a program that declares and prompts the user to enter...

a program that declares and prompts the user to enter two integer and performs the five arithmetic operations

Explain multilevel inheritance, Multilevel Inheritance In multilevel in...

Multilevel Inheritance In multilevel inheritance there is a parent class , from whom we derive another class . now from this derived class we can derive another class and so on

Define the data type qualifiers in c language, Define the Data Type Qualifi...

Define the Data Type Qualifiers in c Language? 1. const 2. volatile const: The const qualifier is used to tell C that the variable value can't change after initialization.

Flow chart, how made a flow chart of prime number by using for loop

how made a flow chart of prime number by using for loop

Create a c project, The project will include Arena models (only .doe files)...

The project will include Arena models (only .doe files) and MSWord document for the report. Thereport must contain the following sections: 1. Introduction: (a)    Statemen

Stack, write a simple c++ program to implement a stack: 1. push 2. pop

write a simple c++ program to implement a stack: 1. push 2. pop

#padovan string, write a java program padovan string program in java ...

write a java program padovan string program in java // aakash , suraj , prem sasi kumar kamaraj college program 1 : package test.padovanstring; public class Pado

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd